plugin addons help/ideas

I am running a zombie forum and was wondering what plugins would you recommend for me to add? I currently only have a blog feature and an extra mobile style. I need some plugin, and other addon links. Thanks in advanced

it is a new forum, and my members are not webmasters so they don't what all I can, and cannot add.

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If you have a fairly large and active community then the bookmarks add-on which allows you, your members to bookmark specific posts/threads is very good and again this is a paid add-on but the author updates regularly and constantly accommodates feature suggestions. http://xenforo.com/community/resources/bookmarks.272/